|
|
Reservoir or Lake Use:
Raw water storage reservoir, located in front of a drinking water plant, to provide some settling and to
take up surge flows in the system. Source water is piped in from a river.
System Overview and Reservoir:
Surface area is 11 acres; volume is 250 acre-feet (81 MG). Maximum depth is 20 feet when full;
average depth is 14 feet. Depth typically fluctuates 2-4 feet during the year. Average withdrawal rate is
3 MGD, so hydraulic residence time is approximately 27 days.
Reported Problem Before SolarBee Installation:
Initial objectives were to resolve problems of high concentrations of algae. During summer months,
owner had to treat the reservoir 1-2 x per week with copper sulfate to prevent clogging in the plant.
Owner had tried using a 30 hp aerator, but shut it down because it did not solve the algae problem
and it had continual mechanical problems.
SolarBee Installation:
Date: July 2002. Installed one SB10000F, solar-powered, with intake hose initially set at 9 feet due to
the sludge depth in the reservoir.
Results:
Algae blooms have disappeared and the City has not had to treat the reservoir with copper sulfate in
the years since the SolarBee unit was installed, even though it was installed after blue-green algae
were established in July (2002). In March 2003, the City disclosed for first time that the reservoir also
had a manganese problem. Therefore, the intake hose was lowered to the deepest part of reservoir
so the SolarBee could perform hypolimnetic oxygenation (maintaining sufficiently high DOs down to
bottom sediments) to prevent manganese release. Lowering the intake hose apparently solved the
manganese problem. By October 2004 enough sludge had been oxidized that the SolarBee intake
was lowered further. Consequently, turbidity readings were greatly reduced when the wind stirred up
the reservoir. The superintendent is very happy with the SolarBee’s performance, and in both 2005
and 2006 purchased additional units for other applications within the water storage/treatment system.
|
|
|
|
SolarBee
|
|
|
|
|
 |
|
|
|
|
|
 |
|
|
|
Unit in reservoir.
|
|
|
|
|
